Variations of the stellar initial mass function in semi-analytical models: implications for the mass assembly and the chemical enrichment of galaxies in the GAEA model

被引：58

作者：

Fontanot, Fabio ^{[1
]}

De Lucia, Gabriella ^{[1
]}

Hirschmann, Michaela ^{[2
]}

Bruzual, Gustavo ^{[3
]}

Charlot, Stephane ^{[2
]}

Zibetti, Stefano ^{[4
]}

机构：

[1] INAF, Astron Observ Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy

[2] UPMC, CNRS, UMR7095, Inst Astrophys Paris, F-75014 Paris, France

[3] UNAM, Inst Radioastron & Astrofis, Campus Morelia, Morelia 58089, Michoacan, Mexico

[4] Osserv Astrofis Arcetri, INAF, Largo Enrico Fermi 5, I-50125 Florence, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 464卷 / 04期

基金：

欧洲研究理事会;

关键词：

galaxies: abundances; galaxies: evolution; galaxies: formation; galaxies: fundamental parameters; galaxies: stellar content; STAR-FORMING GALAXIES; COLD GAS PROPERTIES; LUMINOSITY FUNCTION; POPULATION SYNTHESIS; METALLICITY RELATION; ELLIPTIC GALAXIES; METAL ENRICHMENT; HIERARCHICAL FORMATION; SYSTEMATIC VARIATION; GALACTIC WINDS;

D O I：

10.1093/mnras/stw2612

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper, we investigate the implications of the integrated galaxy-wide stellar initial mass function (IGIMF) approach in the framework of the semi-analytical model GAEA (GAlaxy Evolution and Assembly), which features a detailed treatment of chemical enrichment and stellar feedback. The IGIMF provides an analytic description of the dependence of the stellar IMF shape on the rate of star formation in galaxies. We find that our model with a universal IMF predicts a rather flat [alpha/Fe]-stellar mass relation. The model assuming the IGIMF, instead, is able to reproduce the observed increase of alpha-enhancement with stellar mass, in agreement with previous studies. This is mainly due to the fact that massive galaxies are characterized by larger star formation rates at high redshift, leading to stronger alpha-enhancement with respect to low-mass galaxies. At the same time, the IGIMF hypothesis does not affect significantly the trend for shorter star formation time-scales for more massive galaxies. We argue that in the IGIMF scenario the [alpha/Fe] ratios are good tracers of the highest star formation events. The final stellar masses and mass-to-light ratio of our model massive galaxies are larger than those estimated from the synthetic photometry assuming a universal IMF, providing a self-consistent interpretation of similar recent results, based on dynamical analysis of local early-type galaxies.

引用

页码：3812 / 3824

页数：13

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